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The cylindrical volume rotated 14 degrees penetrates into the building
Designed for a family with two children, Tamatsu house is placed at urban district and a small plot of only 43.21 sq m in Osaka, Japan. The client's former house, which stood at this site, was a wooden two-storey house with little natural light due to the surrounding sites. Therefore the client requested the family room (living area, dining area and kitchen) to be as large as possible, without pillars or road-bearing walls, and that natural light pours into the house.
For a structural reason, the large openings were not able to open out on the road side of the first floor of the building, so the architects rotated the volume of the second floor by 14 degrees for the axis of the building, and interstitial spaces between the rotated wall and the outer wall of the building became voids. A skylight was set up in the upside of the void, and is intended to allow natural light to flow into the family room of the first floor.
One of the two walls rotated 14 degrees on the plan of the second floor is also inclined to the verticality and the part which overlaps with stairs is turned up, like origami. This inclined wall inspires freedom by deviating from the norm and simultaneously effects the refraction of light in the inclination to have a physical effect upon the family.
It therefore appears that the cylindrical volume of the second floor penetrates into the building and box-shaped cantilevered stairs float in the void. Standing out from the rest of the neighbourhood, the building's white box is complete contrast to other buildings along the street and draws attention to its unusual forms.
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